What tubes does the Radford Sta100 use?

The Radford Sta100 uses 2× ECC83 preamp tubes and 4× KT88 power tubes.

When was the Radford Sta100 produced?

The Radford Sta100 was produced 1965–1975.

Radford Sta100 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Radford STA100 is a 100-watt British tube amplifier from Arthur Radford of Bristol, the most powerful amplifier in Radford's lineup and one of the finest British tube designs of its era. Using KT88 output tubes and Radford's signature precision-wound transformers, it delivers clean, authoritative power with remarkable detail. The STA100 is a rare and highly valued collector's piece among audiophiles worldwide.

Years produced: 1965–1975
Made in: UK
Wattage: 100W
Channels: 1
Preamp tubes: 2× ECC83
Power tubes: 4× KT88

Tags: british, vintage, clean.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.